SECOND GEOLOGICAL SURVEY OF PENNSYLVANIA - REPORT OF PROGRESS P. DESCRIPTION OF THE COAL FLORA OF THE CARBONIFEROUS FORMATION IN PENNSYLVANIA AND THROUGHOUT THE UNITED STATES - VOL.III BY LEO LESQUEREUX; ©1884	"Fossil Flora and Fauna of the Pennsylvanian Period, Will County, Illinois" by George Langford (1876-1964)
Lepidodendron Sternbergii  &  Lepidostrobus variabilis. Shown at approximately the same size as George Langford, Sr.'s photograph at right. Leo Lesquereux, Vol.III, Plate CVII, No.2.	Lepidostrobus variabilis. Photograph of the collected fossil, a seed cone. George Langford, Sr.: page 39.

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